The present study deal with nanofluid heat transfer investigation in two-phase closed thermoyphon under magnetic field. The side wall of a top cylinder was cooled by running water through a constant temperature, while the side wall of lower cylinder was electrically heated. In order to study and measure the efficiency, the tube was charged with 5nm silver nanofluid at different concentrations (20 ppm, 40 ppm, 60 ppm, 80 ppm) and was applied various permanent magnetic fields (0.12 T, 0.35 T, 1.2 T). Results illustrated graphically for various features of the solution. According to experimental results, application of magnetic field to evaporator section increases the thermal efficiency of the thermosyphon.

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